Hastelloy Valve Manufacturer and Supplier in India

Hastelloy C276 and Hastelloy B3 valves serve different severe-corrosion duties and should not be treated as interchangeable. C276 provides broad resistance across many oxidizing and reducing environments, while B3 is primarily considered for strongly reducing acid service, including selected hydrochloric-acid conditions. Speciality Valve manufactures Hastelloy C276/B3 valves for compatible severe-corrosion applications. Grade selection should consider concentration, temperature, contaminants, aeration and the required valve function.

Hastelloy C276 vs B3:

C276 is chosen for broad corrosion resistance across many mixed, oxidizing and reducing chemical environments. B3 is a different alloy intended mainly for strongly reducing acids. Oxidizing contaminants can materially affect B3 performance, so concentration, temperature and aeration must be reviewed before the two grades are specified.

Hastelloy C276/B3 Valve Types:

• Hastelloy C276 / B3 Ball Valve: Isolation valve for corrosive processes using a quarter-turn motion.

• Hastelloy C276 / B3 Butterfly Valve: Isolation and flow control valve.

• Hastelloy C276 / B3 Check Valve: Automatic device to prevent flow reversal.

• Hastelloy C276 / B3 Gate Valve: Line isolation valve with minimum flow resistance when fully opened.

C276 and B3 Grades:

• Hastelloy C276: UNS N10276.

• Hastelloy B3: UNS N10675.

Hastelloy Valve Materials:

• Body: Hastelloy C276, Hastelloy B3.

• Trim: Hastelloy C276, Hastelloy B3 or compatible nickel alloy.

• Stem: Hastelloy C276, Hastelloy B3 or suitable corrosion-resistant alloy.

• Seat: Metal or application-specific soft-seat material.

• Packing: Graphite, PTFE or suitable chemical-resistant material.

Choose the wetted grade only after reviewing the complete fluid composition, acid concentration, temperature, pressure and corrosion conditions.

Hastelloy Valve Specifications:

Available pressure classes, dimensions, temperature limits and construction vary by valve design. Commercial C276 valve designs commonly use API 600, API 603, API 602, API 608, API 609, API 6D and ASME B16.34 depending on valve type.

Hastelloy Seat and Packing Options:

The pressure boundary can incorporate Hastelloy body and bonnet components, while wetted trim, seats, stems and packing are selected according to the service medium. Material compatibility across the complete wetted assembly is important when handling aggressive chemicals.

For higher-temperature service, graphite packing and metallic seating may be considered. PTFE and other engineered sealing materials should remain within their applicable temperature and chemical limits.

Hastelloy Valve Applications:

• Compatible chemical transfer, isolation or flow-control duties.

• Petrochemical plants.

• Pipeline isolation, processing or compatible utility duties.

• Boiler, cooling-water or utility duties appropriate to the selected valve and material.

• Seawater intake, discharge or offshore utility duties after material verification.

Hastelloy Valve Testing:

C276/B3 traceability should include positive material identification, chemical-composition review and verification of the selected grade. Dimensional inspection, pressure testing, seat-leakage testing and project-specified non-destructive examination can then be applied to the finished assembly.

Testing may follow API 598, ISO 5208 and applicable valve design standards, with material certificates supplied where required.

C276 or B3 Selection:

Final selection starts with the process chemistry. C276 is generally considered for broad resistance across mixed oxidizing and reducing media, whereas B3 is intended mainly for strongly reducing acid service. Acid concentration, oxidizing contaminants, aeration and temperature must be reviewed before specifying either grade.

Share the complete chemical composition and operating temperature with Speciality Valve to compare C276 and B3 for the required valve application.